Wheel dressing



Nov. '3, 1942. J. P. MURRAY 7 2,300,431

WHEEL DRESSING Filed Oct. 3, 1941 Murray Patented Nov. 3, 1942 I U NiT-E D STAT (Granted under the act of March a, 1883, as 2 amendedApriliii), 1928; 370 '0. G. 757) j The invention described herein may bemanufactured and used by or for the Governmentfor governmental purposes,without the payment to me of any royalty thereon.

. This invention relatives to abrasive wheels and more particularly tothe dressing or resurfacing thereof. s

. Conventional wheel dressing operations involve certain undesirablehazards to men and machineryin the vicinity. One of the most serious ofthese hazards concerns the large amount of abrasive dust thrown into theair in the dressing of dry wheels. Due to the high velocity of the wheelbeing dressed small abrasive particles are Widely scattered in thesurrounding area to be breathed by the workmen in the vicinity andliable to leave a destructively abrasive deposit on the Working surfacesof nearby machines and equipment.

Another serious hazard in ordinary wheel dressing operations is due tothe fact that at least a part of the operators body is directly in linewith the wheel being dressed. In the event of the bursting of adefective wheel, fragments of the wheel may escape the standing guardsand occasionally are thrown violently in the direction of the operatorwith attendant physical injury.

It is the object of this invention to produce a Wheel dressing devicewhich avoids the discharge of abrasive dusts into the surrounding air.

It is a further object of this invention to increase the safety andaccuracy with which a wheel may be dressed.

It is also an object of this invention to greatly prolong the usefullife of wheel dressing devices.

The exact nature of the invention as well as other objects andadvantages thereof will clearly appear from the description of apreferred embodiment as shown in the accompanying drawing in which:

Figure l is a perspective View of a conventional wheel dresser modifiedin accordance with my invention.

Figure 2 is a similar view of a wheel dresser embodying another form ofmy invention.

Figure 3 is a side elevation showing a modified form of coolant supply.

Figure 4 is a side elevation, partly in section, showing the wheeldresser and guide plate in operative position on a tool rest.

It has been observed that in the dressing of wet wheels the water incontact with the tool at the point of dresser action obviates thedischarge of abrasive dust. My invention consists in the provision ofmeans for dispersing water or other coolant through. the medium of thewheel dressing device to avoid dust discharge and to prolong the life ofthe wheel dressing discs or wheels. I p

Referring to the drawing by characters of reference there is shown inFig. 1 a fragment of an emery wheel 1 and a tool res-t2 therefor. Seatedon thetool restZ is a guide plate 3 to provide a plane surface for thesupport of the wheel dresser i. Thewheel dresser comprises a pluralityof dresser wheels 5 rotatably supported in a bonnet 6; The bonnet isprovided with guide lugs no engage the tool rest or guide plate and witha handle 8' permitting the dresser wheels to be held against theabrasive wheel. and moved across the face thereof. An aperture 9 isformed in the dresser bonnet t in which a tube H] is secured. -The tubeIll leads to a coolant bulb H preferably supported on the handleadjacent the grip thereof. This bulb may be either of the type shown orof the type employing builtin inlet and outlet valves and adapted to'act as a pump from an external supply of fluid.

As is well known a wheel may be dressed by engaging the guide lugs withthe guide plate or tool rest in which position raising of the extremityof the handle will tend to rotate the dresser about the point ofengagement of the guide lugs with the guide plate, bringing the dresserwheels into operating relation with the abrasive wheel. The dresser maythen be moved laterally across the working face of the abrasive wheel.Prior to this operation the bulb is filled with water or other coolingfluid and as the dresser wheels operate in resurfacing the wheel asteady pressure on the bulb supplies a continuous flow of cooling fluidto prevent fine dust from being thrown into the air and to cool thedresser wheels, thus increasing the life thereof.

In the modification of my invention shown in.

Figure 2 means have been provided making it possible for the operator toavoid getting any part of his body into the zone in which fragmentswould be thrown in case of the bursting of a defective wheel. show awheel la, a tool rest 2a, guide plate 3a and wheel dresser 4a. The wheeldresser com prises rotating dresser wheels 5a and a bonnet 6a supportingand guarding the same. Guide lugs la are provided on the bonnet toengage the tool rest. A handle I2 is provided on the bonnet in parallelrelation to the axes of the dresser wheels and of the wheel beingresurfaced;

In this figure there is.

A grip [3 at right angles to the handle proper is provided to whichpressure may be applied tending to rotate the device about the guidelugs Ia into contact with the wheel while the tool is reciprocatedacross the face of the wheel being dressed. A coolant tube [a leads to abulb Ila supported on the handle adjacent the grip and cooling fluid issupplied as in Fig. 1.

Figure 3 shows an optional means of supplying water or other coolant tothe tool. A coolant tube lflb is led through a bore in the grip to avalve l4 mounted thereon. A tube [5 leads from the valve to a suitableliquid supply source such as a tank or pipe line.

One of the important factors necessary to the proper and efficientdressing of grinding wheels is a true support for the wheel dressingequipment. Obviously a smooth top face and straight edge are requiredfor best results. Normal usage of grinders usually results in wear anddistortion of the tool rest provided as a part of the grinder proper andthe face of the tool rest thus becomes unsatisfactory for use as a guidefor resurfacing the wheel. In order to remedy this situation holes l6are provided in the top face of the standing tool rest 2 as shown mostclearly in Figure 4. A guide plate 3 having pins ll adapted to engagethe holes I6 is seated on the rest 2. As the guide plate is removableand a part of the wheel dressing equipment it will not receive the wearof ordinary grinding operations and as the wear actually attendant uponthe dressing operation is very slight the plate should have a long life.Should it become worn, resurfacing can be readily accomplished. Such aremovable guide plate will always present a true surface to receive theguide lugs I on the wheel dresser.

Obviously the usefulness of the invention is not limited to dressingdevices employing rotary dressing wheels, as it will be equallysatisfactory with dressers employing relatively fixed devices such asdiamonds or other cutters.

I claim:

1. In a grinding wheel dresser having a handle and means for supportinga dressing tool, a coolant tube secured at one end to said supportingmeans in position to discharge fluid adjacent the point of contact ofthe dressing tool with the grinding wheel, and a coolant bulb supportedadjacent said handle and having its interior in communication with theother end of said tube whereby coolant fluid may be discharged from saidbulb through said tube.

2. In a grinding wheel dresser having a handle and means for supportinga dressing tool, a coolant tube secured at one end to said supportingmeans in position to discharge fluid adjacent the point of contact ofthe dressing tool with the grinding wheel, the other end of said tubebeing in communication with a supply of coolant fluid.

3. In a grinding wheel dresser having a handle and means for supportinga dressing tool, a coolant tube secured at one end to said supportingmeans in position to discharge fluid on said dressing tool, a valve onsaid handle in operative relation with the other end of said tube; and asupply tube leading from said valve to a source

